backup iCal & address book

Just a quick backing up question. i normally back up my entire computer once or twice a month. but recently i have graduated college, moved to colorado and i am busily looking for a job! in doing so i am accumulating a lot of contacts and setting up a lot of meetings etc. i back up my important job searching/ application documents every day, and I want to back up iCal and address book as frequently. I obviously do not need to back up my entire drive every day though, just the important info. what files do i need to back up so i can easily recover my critical address book and iCal data?

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